Built from high quality CNC machined steel, internal track is flat sanded and buffed for a very smooth working action. Upgraded heavy duty springs cut here in Oklahoma for superior performance and years of reliable service. You will not find another auto of this quality for the price. I build each one of these and they come with lifetime warranty. Ive been building knives for over 8 years and do this full time. They work as well as the name brand knives for half the price. I will guarantee you will be impressed or your money back.. Perfect smooth action opens in and out as fast as you can push the button. 8.75″ overall with 3 3/4 inch 440c Blade. Great handle for a superior grip in any weather. I build each one of these and test them for quality control. shipping may be delayed 3-5 days for building time.